Patents by Inventor Tomoji Takura

Tomoji Takura has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Alkali-resistant compositions for forming glass fibers
    Patent number: 4054472
    Abstract: Alkali-resistant compositions for forming glass fibers characterized by comprising, in molecular weight percentage, 58-77% of SiO.sub.2, 4-11% of ZrO.sub.2, 16-24% of an alkali metal oxide and 0.5-3.5% of at least one oxide selected from the group consisting of oxides of iron and oxides of copper, with the proviso that the molecular weight percentages of the oxides of iron and the oxides of copper are calculated in terms of the chemical formulas Fe.sub.2 O.sub.3 and CuO, respectively. Alkali-resistant compositions for forming glass fibers characterized by comprising in molecular weight percentage, 56-74% of SiO.sub.2, 4-6.9% of ZrO.sub.2, 11-20% of an alkali metal oxide, 0.5-3.5% of at least one oxide selected from the group consisting of oxides of iron and oxides of copper with the proviso that the molecular weight percentages of the oxides of iron and the oxides of copper are calculated in terms of the chemical formulas Fe.sub.2 O.sub.3 and CuO, respectively, and up to 12% of an alkaline earth metal oxide.
    Type: Grant
    Filed: May 19, 1976
    Date of Patent: October 18, 1977
    Assignee: Fuji Fibre Glass Company, Ltd.
    Inventors: Masahiro Kondo, Suguru Takehara, Tsutomu Mitsufuji, Moritosi Sasaki, Tomoji Takura